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  Category:Apoidea – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Apoidea?uselang=de

  Keine Beschreibung vorhanden.

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  Evolution and Phylogeny of Bees — Schweizerbart science publishers

  https://www.schweizerbart.de/publications/detail/isbn/9783510550487

  Keine Beschreibung vorhanden.

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  The Bees of the World - Charles Duncan Michener - Google Books

  https://books.google.de/books?id=bu_1gmY13FIC

  A comprehensive, worldwide treatment of all groups of bees - 1200 genera and subgenera, including more than 16,000 species. In extensive introductory sections, Charles D. Michener examines the evolution of bees from wasps, the relations of the families of…

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